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Author Topic: What type of caps are these?  (Read 2737 times)
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wb6kwt
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« on: June 21, 2011, 07:46:17 PM »

I'm trying to get a Globe Champ 350 up and running and came across caps in the VFO parts list, marked TCN and TCZ, any idea what those designators mean?

Thanks,

Bob

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w3jn
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« Reply #1 on: June 21, 2011, 10:45:30 PM »

Most likely temperature compensation caps.  TCN probably is a negative temp coefficient (ie N750 in today's parlance) , TCZ is probably zero coefficient (NP0).
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KA2DZT
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« Reply #2 on: June 22, 2011, 03:14:46 AM »

W3JN is probably right although I've never seen those designators that I can remember.

Usually temperature compensation type caps are disc ceramics.

Are the caps disc ceramic??  Are the designators on the caps or are you reading them from a parts list??

Answer to my own question, your post states the VFO parts list.

The caps should be marked with the negative temp coefficient number.  There are more than just N750.

Unless the VFO is drifting too much I would just leave those caps as is.

Fred
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KM1H
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« Reply #3 on: June 22, 2011, 03:55:28 PM »

TC caps were initially tubular (or sealed to appear solid) dogbone ceramics and were available fom 0 to -5600 and some positve versions also. Discs came along later.

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KA2DZT
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« Reply #4 on: June 23, 2011, 01:53:23 AM »

TC caps were initially tubular (or sealed to appear solid) dogbone ceramics and were available fom 0 to -5600 and some positve versions also. Discs came along later.



Thanks, I forgot about the dogbone ceramics, I have a lot of those somewhere.

Fred
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